The learner will identify what causes discontinuities within the GMAW process.
Hardening in the heat-affected zone causes _______________.
Hardening in the heat-affected zone causes _______________.
HAZ cracks
Hardening in the heat-affected zone causes _______________.
HAZ cracks
Workpiece contamination causes ______________.
Workpiece contamination causes ______________.
porosity
Welding voltage set too high causes ______________.
Welding voltage set too high causes ______________.
undercutting
Welding voltage set too high causes ______________.
undercutting
Rapid cooling in the crater at the end of the joint causes _______________.
Rapid cooling in the crater at the end of the joint causes _______________.
weld metal cracks
Rapid cooling in the crater at the end of the joint causes _______________.
weld metal cracks
Insufficient heat input causes __________.
Insufficient heat input causes __________.
incomplete fusion
Excessive contact tube-to-work distance causes _______________.
Excessive contact tube-to-work distance causes _______________.
porosity
Excessive contact tube-to-work distance causes _______________.
porosity
Excessive heat input causes ________________.
Excessive heat input causes ________________.
excessive melt-through
Excessive heat input causes ________________.
excessive melt-through
Improper gun angle causes _________________.
Improper gun angle causes _________________.
undercutting
Inadequate shielding gas coverage causes ________________.
Inadequate shielding gas coverage causes ________________.
porosity
Inadequate shielding gas coverage causes ________________.
porosity
Too large a weld puddle causes ______________.
Too large a weld puddle causes ______________.
incomplete fusion
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